This book constitutes the refereed proceedings of the 11th International Workshop on Enterprise
and Organizational Modeling and Simulation EOMAS 2015 held at CAiSE 2015 in June 2015 in
Stockholm Sweden. EOMAS was founded with the purpose to become a forum among researchers and
practitioners to share their research and practical findings by encouraging the dissemination
of research results under a more generic umbrella called enterprise engineering which
encompasses internal factors ranging from organizational complexity to intricacy of business
processes and sophistication in workflows as well as external factors and uncertainties such as
competition politics or the emergence of innovative technologies. The 15 papers presented in
this volume were carefully reviewed and selected from 28 submissions. They were organized in
topical sections named: enterprise conceptual modeling and simulation enterprise modeling
formal foundation and enterprise optimization.